This is a beautiful place located at the north in Mexico City. It is and ancient house with excellent maintenance, but the better is the food and the service (not in this order necessarily).
The waiters know their jobs, they memorize the menu and can suggest you many things. The food quality is great and the flavor too. There is a lady offering "salsas molcajeteadas" that she prepare besides your table, you "have to" try one of those.
The environment is so relaxing with the piano music and the quiet surroundings (you cannot believe you are a few meters away of one of the busiest avenues in Mexico City).
Go, you will not regret the trip to that place.